<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>

<form action="" method="post">
    用户名: <input type="text" name="username">
    密码: <input type="password" name="password">
    <input type="submit">
</form>


</body>
</html>